president obama vowed to find those responsible for the bombings and to bring them to justice. the president never mentioned the word terrorism but the fbi is treating the explosions as a terror act. no group so far has claimed responsibility for the blasts. >>> cities around the country have increased police patrols in light of these bombings. the secret service has spannedded its security perimeter on the white house as well. and police in london are getting very strict with their security because the london marathon is coming up this sunday. >> wusa9's delia goncalves is live in the satellite center with more on the response to the explosions. >> what are the latest developments we're hearing, delia? >> reporter: we can tell you that police along with the f.b.i. and several other federal agents have raided a home in revere, the suburbs of boston. they made that raid last night. we don't quite know the connection at this point. of course, this investigation still unfoaldzing. the blast -- unfolding. the blasts have shaken bostonians and many folks around the world. cbs report